Fuse-plug.



C L DICKSON.

FUSE PLUG\ APPLICATION FILED JULY 8, 1916. 1,262,463. Patented Apr.9,1918.

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C L DICKSON, OF CHATTANOOGA, TENNESSEE.

FUSE-PLUG.

Specification of Letters Patent.

Patented Apr. 9, 1918.

Application filed July 8, 1916. Serial No. 108,225.

To all whom it may concern:

Be it known that I, C L DICKsoN, a citizen of the United States,residing at Chattanooga, in the county of Hamilton and State ofTennessee, have invented certain new and useful Improvements in F use-Plugs; and I do hereby declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same.

This invention relates to new and useful improvements in fuse locks andthe principal object of the invention is to provide a fuse lock which isso constructed as to pre* vent the theft of current.

It has been discovered that in a three wire system the loosening of oneof the outer fuses while discontinuing its particular circuit will notaffect the circuit through the opposite outer fuse but will stop theoperation of the meter. In this way it will be seen that the power couldbe used without being registered and the object of the present inventionis to provide a lock which is so constructed as to prevent the outerfuses from being loosened without the knowledge of the power company.

A still further object of the invention is to provide a novel form oflock for holding the fuses in place and preventlng thelr loosening orremoval.

With these and other objects in view, the invention consists in thenovel combination and arrangement of parts which will be fully set forthin the following specification and accompanying drawing, in which Figure1 is a view showing the method of looking a plurality of fuses.

Fig. 2 is a side view of one of the fuses used in the constructionillustrated in Fig. 1.

Fig. 3 is a side view of a fuse illustrating a modified form of lock,and

Fig. at is a view showing the method of locking the fuses such as areconstructed in accordance with that illustrated in Fig. 3.

Referring to the drawing, the numeral 1 designates the main body of afuse provided with the usual threaded contact shell 2. The centralcontact is designated by the numeral 3 and the contacts 2 and 3 areconnected by the usual fuse wire (not shown). The plug 2 is providedwith the plug cap 4 as in the ordinary way and this cap is provided witha central upstanding cylmdmcal portion 5 formed with a plurality oftransversely distion of the sealing posed diametrical openings 6 for therecepwire. The sealing wire is designated by the numeral 7 and the fusesare tightened into their sockets as illustrated in Fig. 1 and then theopenings 6 are arranged so that they aline in all of the fuses when thewire 7 is passed therethrough and twisted at 8 and a seal 9 is thenpressed on the twisted portion s0 as to prevent the re moval of the wireand loosenin of any of the fuses WithOllt the knowle ge of the powercompany.

In the form of the invention illustrated in Fig. 3 the body of the fuseis designated by the numeral 10 and is provided with the usualexternally threaded contact shell 11. The central contact of the fuse isdesignated by the numeral 12 and these contacts are connected by theusual fuse wire (not shown). The fuse cap is designated by the numeral13 and is provided with a depending extending ear 14 which is providedwith an internally screw threaded bore to receive the set screw 15 bymeans of which the cap is securely held in place. The head of the screwdesignated by the numeral 16 is provided with aplurality of transverseopenings 17 which are arranged to be turned into alinement after thefuses are placed into position in the fuse box to receive the sealingwire 18. This wire is passed through the several screws as shown in Fig.4 and the ends of the wire are intertwisted as at 19 and a seal 20 isthen impressed over the ends of this wire to prevent any tampering withthe fuses.

It will be apparent from the foregoing that in use the fuses are placedin the fuse block as illustrated in Figs. 1 and 4 and thus the circuitis completed. The connecting of the meter is such that upon looseningeither of the outer fuses the circuit controlled by said fuse will, ofcourse, be discontinued while the circuit through the opposite fuse willbe unaffected, and yet the meter will not run. The passage of thesealing wires through their openings to lock the fuses against rotationwill effectively frustrate any attempt to render the meter inoperativeand thus the use of current from either of the circuits will be recordedand the possibility of defrauding the power company in this manner willbe eliminated.

While in the foregoing there has been shown and described the preferredembodiment of this invention, it is to be understood that such changesmay be made in the combination and arrangement of parts as will fallwithin the spirit and scope or" the appended claims.

What is claimed is 1. In a fuse plug adapted to be threaded into a fuseblock, and having a cap, a set screw carried by the cap and projectingradially therefrom, the head of said screw being provided with aplurality of transverse openings and a sealing wire adapted to be passedthrough the openings in the heads of the screws carried by two separateplugs to prevent the plugs from being turned and loosened from theirposition in the fuse block.

2. In a fuse plug adapted to be threaded into a fuse block, and-having acap, an ear depending from the cap, a set screw threaded through the earand adapted to hold the cap in place the head of the set screw beingprovided with a plurality of transverse openings and a sealing Wireadapted to be passed through the openings in the screws of adjacentplugs to hold said plugs against rotation.

